/*
 * Copyright (C) 2007 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.example.android.apis.graphics;

import android.content.Context;
import android.graphics.*;
import android.os.Bundle;
import android.view.*;

public class MeasureText extends GraphicsActivity {

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(new SampleView(this));
	}

	private static final int WIDTH = 50;
	private static final int HEIGHT = 50;
	private static final int STRIDE = 64; // must be >= WIDTH

	private static int[] createColors() {
		int[] colors = new int[STRIDE * HEIGHT];
		for (int y = 0; y < HEIGHT; y++) {
			for (int x = 0; x < WIDTH; x++) {
				int r = x * 255 / (WIDTH - 1);
				int g = y * 255 / (HEIGHT - 1);
				int b = 255 - Math.min(r, g);
				int a = Math.max(r, g);
				colors[y * STRIDE + x] = (a << 24) | (r << 16) | (g << 8) | b;
			}
		}
		return colors;
	}

	private static class SampleView extends View {
		private Paint mPaint;
		private float mOriginX = 10;
		private float mOriginY = 80;

		public SampleView(Context context) {
			super(context);
			setFocusable(true);

			mPaint = new Paint();
			mPaint.setAntiAlias(true);
			mPaint.setStrokeWidth(5);
			mPaint.setStrokeCap(Paint.Cap.ROUND);
			mPaint.setTextSize(64);
			mPaint.setTypeface(Typeface.create(Typeface.SERIF, Typeface.ITALIC));
		}

		private void showText(Canvas canvas, String text, Paint.Align align) {
			// mPaint.setTextAlign(align);

			Rect bounds = new Rect();
			float[] widths = new float[text.length()];

			int count = mPaint.getTextWidths(text, 0, text.length(), widths);
			float w = mPaint.measureText(text, 0, text.length());
			mPaint.getTextBounds(text, 0, text.length(), bounds);

			mPaint.setColor(0xFF88FF88);
			canvas.drawRect(bounds, mPaint);
			mPaint.setColor(Color.BLACK);
			canvas.drawText(text, 0, 0, mPaint);

			float[] pts = new float[2 + count * 2];
			float x = 0;
			float y = 0;
			pts[0] = x;
			pts[1] = y;
			for (int i = 0; i < count; i++) {
				x += widths[i];
				pts[2 + i * 2] = x;
				pts[2 + i * 2 + 1] = y;
			}
			mPaint.setColor(Color.RED);
			mPaint.setStrokeWidth(0);
			canvas.drawLine(0, 0, w, 0, mPaint);
			mPaint.setStrokeWidth(5);
			canvas.drawPoints(pts, 0, (count + 1) << 1, mPaint);
		}

		@Override
		protected void onDraw(Canvas canvas) {
			canvas.drawColor(Color.WHITE);

			canvas.translate(mOriginX, mOriginY);

			showText(canvas, "Measure", Paint.Align.LEFT);
			canvas.translate(0, 80);
			showText(canvas, "wiggy!", Paint.Align.CENTER);
			canvas.translate(0, 80);
			showText(canvas, "Text", Paint.Align.RIGHT);
		}
	}
}
